M. D. Usher is the Lyman-Roberts Professor of Classical Languages and Literature and a member of the Department of Geography and Geosciences at the University of Vermont. With his wife, he also built, owns, and operates Works & Days Farm in Shoreham, Vermont. His previous books include How to Be a Farmer: An Ancient Guide to Life on the Land (Princeton), Plato's Pigs and Other Ruminations, and a number of books for children, including Diogenes.